Liquid flow control

Details Liquid flow control Liquid flow control

1979-01-19

1981-03-24

Cohan, Alan

Fluid handling

Processes

With control of flow by a condition or characteristic of a...

137396, G05D 700

Patent

active

042574374

ABSTRACT:
A method and apparatus to control the flow of liquid through a valve, especially at very low levels down to about 0.5 ml/hour, by monitoring the liquid level in a column of liquid using a sensor, for example a photo-electric cell, which is moved along the column at a predetermined rate corresponding to the liquid flow rate desired, generating a signal from the sensor which is representative of the liquid level, and using the signal to control the opening and closing of the valve to maintain the liquid flow at the desired rate.

REFERENCES:
patent: 2814303 (1957-11-01), Fifer
patent: 3446222 (1969-05-01), Barker

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